Javascript/jQuery: Replace items in string matching {x} with "jQuery('#resultsx').val()" -


I have a string that contains a formula, such as 

  {1} + { 2} - {3} * {4}

I have different input fields such as

It will be as such 

  15 + 25-35 * 45

which will then calculate -1535

Hopefully I have clarified what I want to do clearly but let me know that I am not. I have tried to use regexps, but my head does not get completely around it and I'm not sure that this direction should go to me.

2 can take a function as a parameter that will help here: 

  var equ = '{1} + {2} - {3} * {4}'; Equ = equ.replace (/ {(\ d +)} / g, function (match, $ 1) {return $ ('# result' + $ 1) .val ();});

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